Collapsible scaffolding



Jan. 16, 1934.

C. E. LANDBERG COLLAPSIBLE SCAFFOLDING Filed Sept. l2 193 2 2 SheetS-Sheet l 7225 Zar/0695, MN @79M y Jan. 16, 19734. C, E, LANDBERG 1,943,871

COLLAPS IBLE SCAFFOLDI NG 2 Sheets-Sheet '2 Filed Sept. 12 1932 Patented Jan. 16, 1934 UNITED STATES PATENT OFFICE y Application September 12, 1932 Serial No. 632,662

6 Claims.

My invention provides a simple and highly eiiicient collapsible scaffolding especially adapted for use by interior decorators, plasterers, paperhangers and the like, and generally stated, the

-5 same consists of the novel devices, combinations of devices and arrangement of paris hereinafter described and defined in the claims.

A scaffolding, for the purpose above indicated, should be vertically adjustable to a considerable i extent and to be efficient, should be very wide, or at any rate, much wider than the width of ordinary door openings. This improved scaffolding is so arranged that it may be quickly collapsed for movement through door openings without `M-requiring complete disconnection of the various parts and without requiring much manipulation.

In the accompanying drawings, which illustrate a commercial form of the invention, like characters indicate like parts throughout the several views. Referring to the drawings:

Fig. 1 is a plan View of the scaffolding showing the same extended or set up for use, some parts being broken away;

Fig. 2 is a side elevation of the scaffolding shown in Fig, 1;

Fig. 3 is a plan view showing the scaffolding collapsed or narrowed up for movement through door openings or other narrow passages;

Fig. 4 is a View looking at one end of the scaffolding, some parts being broken away;

Fig. 5 is a vertical section taken transversely of the scaffolding just inward of the left end crossbar of Fig. 1, looking upward to the left;

Fig. 6 is a section taken on the line 6-6 of Fig. 1, some parts being broken away;

Fig. 7 is a fragmentary section taken on the line 7-7 of Fig. 2;

Fig. 8 is a fragmentary perspective with certain parts sectioned on the irregular line 8 8 of Fig. 1; and

Fig. 9 is a fragmentary View of the parts in the vicinity of the line marked 9 9 on Fig. 3.

The main elements of the scaffolding are four leg posts 10, two side rails 11, end crossbars 12, intermediate crossbars 13 and 14, an oblique lock bar 15 and walk-forming boards 16 and 17. The side rails 11 are provided with oblique brace bars 13 rigidly secured thereto. The ends of the side rails 11 and the ends of the brace bars 18 are rigidly but adjustably secured to the leg posts 10 by nut-equipped bolts 19 that are insertable through vertically spaced holes 20 formed in said posts. This makes the scaffolding vertically ad- `justable. The end crossbars 12 are preferably (Cl. S04- 2) in the form of trussed frame members connected by hinges 21 that adapt said end members to fold withltoggle actions. The intermediate crossbars 13 and 14 are connected to opposite side railsv l1 by-hinges 22 and at theirreleasable ends are detachably connected to Jille respective opposite rails 11 by couplings preferably in the form of hinges 23 equipped with removable pintle pins 24 secured to the respective side rails by` short chains or flexible connections 25 that prevent the same from being lost. The oblique lock bar 15 is connected at one end to one of the side rails 1l by a hinge 26 and at its opposite end is detachably connected to one of the crossbars, to wit: as shown, crossbar 14 by a detachable coupling preferably formed by a hinge 27 having a removable pintle 28 attached to said bar 14 by a chain or liexible connection 29.

The outside walk bars 16 are connected to the adjacent side rails 11 by hinges 30 that permit 75, the same to be turned outward and against the outer sides of said side rails, as shown in Fig. 9. To hold the folded side members properly spaced when contracted as shown in Figs. 3 and 9, the leg posts 10 on one side are provided with long hooks 31 that are engageable with eyes 32 on the opposite leg posts. When the scaffolding is set up for use, as shown in Figs. 1, 2, 4 and 5, the walk boards 17 will be loosely placed on the crossbars, and the outer board 17 will be turned down onto the said crossbar. The so-called lock bar 15, when secured as best shown in Fig. 1, forms a brace that locks the structure against collapsing movements, and of course, at such times, the toggle-acting end bars 12 will be straightened out, and when the device is to be collapsed or contracted in width, the hinged pintles 24, 24 and 28 will be removed and then the crossbar 13 and lock bar 15 will be turned, as shown by arrows, and folded against one of the side bars 11 and the cross-bar 14 will be folded against the other side bar and, of course, the end bars 12 will be then buckled, all as best shown in Fig. 3. This makes the structure so narrow that it will go through any door or any narrow passage. It is also desirable that the boards 16 be turned outward and downward, as best shown in Fig. 9. This collapsing, of course, can be accomplished without changing the vertical adjustment of the platform or walking portion of the scaffolding.

Obviously, the device will be readjusted or spread out for use by reversing the operations above noted. The braces 18 give the scaffolding longitudinal stability, while the frame-lock end bars or members 12 give the device lateral sta- 110 bility. As already stated, the lock bar renders the structure rigid against collapsing or folding movement.

From what has been said, it will be understood that that device described is capable of modication Within the scope of the invention herein disclosed and claimed.

What I vclaim is:

1. A collapsible `scaffolding comprising leg posts, side lbars rigidly secured to said leg posts, foldable crossbars connecting said side bars, a foldable oblique lock bar connecting one of said side bars to one of said crossbars, and outside and intermediate Walk boards, the former being hinged to said side bars for folding movements and the latter being loosely applicable on said crossbars.

2. The structure dened in claim 1 in which the end crossbars are in the form of frame sections hingedly connected together and to said side bars.

' '35 A collapsible scaiolding comprising legforming posts, side bars rigidly connected to said posts, toggle-acting end crossbars connecting the end portions -of said side bars, an intermediate crossbar hingedly connected to one of said side bars and detachably connected to the other side bar, and a foldable oblique lock bar hingedly connected to one 'of said side bars and detachably connected to said intermediate crossbar.

4. The structure defined in claim 3 in further combination with a second intermediate crossbar hingedly connected to one of said side bars and detachably connected to the other side bar.

5. A collapsible scaolding comprising legforming posts, side bars rigidly connected to said posts but vertically adjustable thereon, inwardly buckling toggle-acting end crossbars connecting the end portions of said side bars, a pair of intermediate crossbars hingedly connected one to each of said side bars and detachably connected to opposite side bars, and an oblique folding lock bar hingedly connected to one of said side bars and detachably connected to one of said intermediate cross'fbars.

6. A collapsible scaolding comprising leg- `forming posts, side bars rigidly secured to said posts, jointed end frames made up of trussed rectangular frame members hingedly connected to said posts at their outer ends and hingedly connected together at their inner ends for inward folding movements, and a foldable oblique lock bar connected between said side bars and serving to hold said side bars against relative endwise movement when separated by straightening of said jointed end frames.

CARL E. LANDBERG. 

